Control device



Feb. 16, 1932. D, B- WE 1,845,227

' CONTROL DEVICE Filed June 29, 1928 1' NYENTOR GE-oRez: 0. Bo wER Patented Feb. 16, 1932 GEORGE D. BOWER, OF COLUMBIA HEIGHTS,

HONEYWELL REGULATOR COMIPANY, F MINNEAPOLIS, MINNESOTA, A CORPORA- TION OF DELAWARE common Application filed Jane 29,

This invention relates to improvements in control devices and has among its objects to provide a control circuit whereby devices which require difi'erent amperages may be operated from a single power source, and the operation automatically controlled by a switch-like device requiring only a minimum of current, and therefore in a manner to prevent fusing of the contacts.

Another object of the invention is to provide a control device in which a double contact thermostatic switch in which the contacts are alternately closable, can operate a, relay in a manner to close the relay when one of the contacts is closed, and to cause an opening of the relay when the other contact.

closes, with an arrangement whereby when the control device is engaging neither contact, and after energization of the electromagnetic device, said device is held in energized condition.

Features of the invention include the details of construction, although there is no in tention to be limited to these details.

Objects and advantages will appear in the description of the drawing forming a part of this application, which drawing illustrates diagrammatically one form of the invention. I

The device. as now constructed comprises an electro-magnetic device having two coils wound on one core, and connected for opposite polarity. The device has the form of a relay, and includes the core 1 and coils 2 and 3 respectively. :The coils are wound in multiple and are connected for opposite polarity. A thermostat or equivalent switch is used to control the coils and comprises a' movable memberR operating, in this instance, between contacts BW. -A single source of power is indicated zit-1.0, in this instance the secondary :of a transformer the primary of which is shown at 11. One side of 10 is connected by a conductor 12 with one end of coil 2, and the opposite end of coil 2 is connected by-conductor 13 with contact B. The opposite side of source 10 is connected by a conductor 15 with line 16, which in-turn is connected on one side with the movable element 50 R of the switch. The contactWof the switch MINNESOTA, ASSIGNOR T0 MINNEAPOLIS- DEVICE 7 1928. Serial No. 239,305.

ing the coils 2 and 3, are a pair of switch arms respectively designated 25-26 operating against contacts respectlvely designated 2728.' These arms are connected as at 26a 7 to move in unison, and are biased by gravity or by means of a spring 27 b, acting on the connection 26a. Switch arm 26 may be considered the armature of the relay, the arm 25 being connected for movement by this armature. Contact 27 is connected by conductor 29 with line 16. Switch member 25 is connected by conductor 26 with line 13. Contact 28 is connected by conductor 30 with line 12 and armature 26 is connected with line 22.

The switch including the contact elements 2527 is arranged to control power to coil 2 independently of the switch or thermostat which in cludes the elements R, B and W. This switch 25 closes on energization of coil 2; and simultaneously closes the'switch comprising the members 2628. This latter switch controls current from the source 10 to l the coil 3, and when it closes, coil 3 is conditioned to receive current.

- Operation 'Again referring to the drawing: Assume a call for heat by the room thermostat, that is assume the element R sufliciently cold to move toward the left and engage the contact B. Energization of coil 2 will take place in the following manner: 10, 12, 2, 13, B, R, 16, 15, to 10. At the same time switches 25 and 26 will close. 'Now assume that element R is heated and moves, for instance to the position shown in the figure where it does not engage either of the contacts. Under these conditions, coil 2 will remain energized through the following circuit: 10,12, 2, 13, 26', 25, 27 29, 16, 15 to 10. Now suppose the thermostat to heat sufiiciently to engage contact W. Coil 3 will be energized in the following manner: 10, 12, 30, 2s, 26, 22, 21 3, 20, W, R, 16, 15 to 10. However on energization of coil 3, the magneticv effect of coil 2 is sufficiently an- Ill nulled to permit the biased switches and 26 to open. As the result, the system will again assume the .condition shown in the .drawing, except that element R under these I closed, and to interrupt fuel supply whenever the magnetic eflect is annulled, for example if the element R of the room thermostat is sufiicientlyhot to engage at W. Fuel is supplied whenever the room thermostat is sufficiently cold to make contact at RB. This is a valuable feature of the invention, but-it will be understood that the device may be used for other purposes.

Another feature of the invention is thearrangement whereby the thermostat, handles onlythe loads of coils 2, 3, which loads are relatively small, in this instance about onefourth of an ampere, while the valvecoil 32 carries about two amperes. In other words,

the larger loads are arranged in this .circuit so that they are never handled through contacts BW but through switch 26 Therefore, the thermostatic control circuit is never operated at an amperage sufiiciently high to fuse the contacts of the thermostat, notwith standing the fact that all circuits are operated from a common power source. Tracing the circuit for the coilr32 of the valve when the switch 26-is closed: source 10, 15, 35, 32, 3c, 22, 26, 2s, 30, 12 to 10. 4

It is also conceivable that the armature or switch arm 26 can operate an auxiliary contact or switch arm 40 which operates against a contact 41 to control any other kind of a circuit generally indicated at 42. Although the element 40 has been shown in a position to close when the switch arms 25 and 26 close, it is evident' that the contact could as well be made to open. It is also evident that the. character of all contacts maybe varied, and

the number changed to suit conditions.

Although in the present instance two coils have been wound in multiple on one core, or

- in one relay, and have been connected for opposite polarity, it is conceivable that other arrangements may be had in which electromagnetic efiects can be produced to operate Y the switches, and that other means may be used for annulling these efiects through operation iii a separate contact of a thermostatic switch or equivalent device through a contact corres onding in the present circuit to contact There is no intention to be limited to the exact construction shown.

I claim as-my invention:

1. A device of the class described comprising an electric power source, a relay having an operating and a bucking coil, a contact controlled by the relay, a switch having first and second contacts respectively controlling initial energization of said rela bv energization of said operating coil, an de-energization of said relay by 'energization of said bucking coil, an electric load, and circuit connections adapted to initially energize said operating coil independently of said relay contact, and energize said load circuit through said relay contact, and on, closureof the sec- 0nd contact to energize said bucking coil also through said relay contact.

2. A device of the class described comprising an electric power source, a relay having an operating and a bucking coil, a contact controlled by said relay, a switch having con-. tacts respectively adapted to control initial energization of said relay by energization of said operating coil, and e-energization of saidrelay by energization of said buckingcoil, an electric load, and circuit connections adapting one switch contact to initially energize said operating coil independently of the relay contact and energize said load through said relay contact as the result of relay closure, and adapting the other switch contact to energize said bucking coil also through said relay contact.

3. A re ay having an operating and a bucking coil and controlling two contacts first and second, a switch having first and secoperating coil including t e first contact of said rela acircuit for said electric load which inc udes the second contact of said relay, and an energizing circuit for said buck mg coil which includes therein said second re ay contact, and the second contact of said switch. q

In witness whereof, I have hereuntoset my hand this 26th day of June, 1928.

GEORGE D. BOWER. 

